31640471173016 has 64 divisors (see below), whose sum is σ = 66083083092000. Its totient is φ = 14132533381120.

The previous prime is 31640471172997. The next prime is 31640471173019. The reversal of 31640471173016 is 61037117404613.

It is a super-2 number, since 2×31640471173016² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31640471173019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67754015 + ... + 68219406.

Almost surely, 2^{31640471173016} is an apocalyptic number.

It is an amenable number.

31640471173016 is an abundant number, since it is smaller than the sum of its proper divisors (34442611918984).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31640471173016 is a wasteful number, since it uses less digits than its factorization.

31640471173016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135973532 (or 135973528 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 44.

Adding to 31640471173016 its reverse (61037117404613), we get a palindrome (92677588577629).

The spelling of 31640471173016 in words is "thirty-one trillion, six hundred forty billion, four hundred seventy-one million, one hundred seventy-three thousand, sixteen".